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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A334155 a(n) is the number of length n decorated permutations avoiding the pattern 001.

Table of values

n a(n)
0 1
1 2
2 5
3 15
4 57
5 273
6 1593
7 10953
8 86553
9 771993
10 7666713
11 83871513
12 1001957913
13 12976997913
14 181106559513
15 2709277004313
16 43247182412313
17 733699248716313
18 13182759232076313
19 250070586344012313
20 4994229502288460313
21 104743211837530700313
22 2301653725221036620313

List of values

[1, 2, 5, 15, 57, 273, 1593, 10953, 86553, 771993, 7666713, 83871513, 1001957913, 12976997913, 181106559513, 2709277004313, 43247182412313, 733699248716313, 13182759232076313, 250070586344012313, 4994229502288460313, 104743211837530700313, 2301653725221036620313]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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